Dylann Roof is escorted into the court room at the Charleston County Judicial Center to enter his guilty plea on murder charges in state court for the 2015 shooting massacre at a historic black church, in Charleston, South Carolina on April 10, 2017.Grace Beahm / Pool via Reuters file

Roof wrote in his appeal: "It will be impossible for me to trust two attorneys that are my political and biological enemies."

Roof was sentenced to death in January after being convicted of hate crimes in the killings of nine black worshippers at Charleston's Emanuel AME Church in June 2015.